Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdc151c6bc4b92e6…

MALICIOUS

PDF

78.2 KB Created: 2021-09-07 14:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 56de9565085f23a2b794b9edc90d722e SHA-1: 8a8507fd9815904ba390ba572e0af0340ffd73d6 SHA-256: cdc151c6bc4b92e678cad5761c701028cef354a96bc8750d470c08156876d732
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs pointing to other PDFs hosted on compromised websites. This suggests the document is designed to redirect users to malicious content, likely for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/671611f04732036a233c3de1414e734c/89053993801.pdf In PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/6ad6f142a3333c267ad57408403eeb22/94931482375.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/taluwaruzo.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d10f9e93b---kuzulibalefuxibikewafile.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/12049998050.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/71042392328.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/somowopiwa.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/xafuginemekavovu.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///mojilukafetalibud.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/80331741893.pdfIn PDF document text
    • http://wghsclassof69reunion.com/clients/b/b3/b33699c65747f61a54cd06c2fab73d22/File/bofabufun.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/4eef28e6f65aaec947aa810895dafc61/rufubobitutubuxugad.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/1296755794.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16075d9e928953---tigugefedu.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/kokigosedarewagalo.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/suwenidamewemenoku.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d41a5ae95---5971483613.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161369a3b312b8---vatuzakamabeta.pdfIn PDF document text
    • http://galgalesh.com/userfiles/file/pipevusekavasesoza.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0efaa35132---94374317997.pdfIn PDF document text
    • http://hanleyresources.com/images/funewudumuvoxiw.pdfIn PDF document text
    • http://bscartridge.com/pic/bexatuz.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/wosejaj.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/caa4ef04fd38fcd7c9b2f57a8e5266c8/32799175697.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=scholastic+pre+k+worksheetsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA2 18072 bytes
SHA-256: 64f8501faedf2166b8bfcafb69acfc88159a1a4e354d3b603750a42afbcbdf7a
font_01_sfnt_off0000fa65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001127c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127C 10620 bytes
SHA-256: 7040d3b8d80d80cbe80ba6f1ba5bf8e655462a1df85dc5de366b541872173b8d

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